<!DOCTYPE html>
<html lang="zh-CN">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1,user-scalable=no">
    <!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
    <title>Bootstrap 101 Template</title>
    <link rel="stylesheet" href="lib/bootstrap-3.3.7-dist/css/bootstrap.css">
    <style>
      [class^=col]{
        height: 20px;
        border: 1px solid #333;
      }
     
    </style>
  </head>
  <body>
    <div class="container">
      <div class="row">
        <div class="col-sm-3 col-xs-6"></div>
        <div class="col-sm-3 col-xs-6"></div>
        <div class="col-sm-3 col-xs-6"></div>
        <div class="col-sm-3 col-xs-6"></div>
      </div>
      <div class="row">
        <div class="col-sm-6"></div>
        <div class="col-sm-6"></div>
      </div>
      <div class="row">
        <div class="col-sm-4"></div>
        <div class="col-sm-8"></div>
      </div>

      <h1>你好，世界！</h1>
      <h2>adsf</h2>
      <p></p>
    </div>

    <!-- jQuery (Bootstrap 的所有 JavaScript 插件都依赖 jQuery，所以必须放在前边) -->
    <script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
    <!-- 加载 Bootstrap 的所有 JavaScript 插件。你也可以根据需要只加载单个插件。 -->
    <script src="lib/bootstrap-3.3.7-dist/js/bootstrap.js"></script>
  </body>
</html>